Silicone Adhesive with Absorbent Fillers for NPWT
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Solution Overview
Problem
Existing skin-contacting adhesives are prone to loss of adhesiveness when exposed to body fluids, leading to skin irritation and disintegration, particularly in applications requiring repositionability and visual wound inspection.
Innovation Solution
A polysiloxane adhesive composition with dispersed absorbent fillers, such as hydrocolloids or superabsorbent polymers, which maintains adhesion and prevents skin irritation by controlling moisture absorption and swelling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If more aggressive adhesives are used to maintain adhesion in body fluids, then adhesion strength is improved, but skin irritation and destruction of the outer skin layer worsen
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by incorporating specific absorbent polymers (superabsorbent materials) into the adhesive matrix. These polymers have controlled absorbency rates and swelling properties that allow the adhesive to maintain strong adhesion in body fluids while being gentler on skin, thus resolving the contradiction between adhesion strength and skin irritation
Solution Approach 2:
The patent creates a composite adhesive material combining traditional adhesive components with absorbent polymer particles. This composite structure allows the adhesive to benefit from both the bonding properties of the base adhesive and the moisture-controlling properties of the absorbent polymers, enabling strong adhesion without excessive skin irritation
2Duration of action of stationary object
If hydrocolloids are used to absorb moisture and maintain adhesion, then adhesion duration is improved, but adhesive matrix disintegration worsens due to swelling
Solution Approach 1:
The patent applies local quality by using absorbent polymer particles distributed throughout the adhesive matrix. These particles locally absorb excess moisture and control swelling at specific sites, preventing overall matrix disintegration while maintaining adhesion duration. The localized moisture management allows the adhesive to remain stable while still providing prolonged adhesion
Solution Approach 2:
The patent utilizes the porous structure of absorbent polymer particles to selectively absorb moisture from body fluids. The porous material allows controlled moisture uptake without excessive swelling, maintaining the integrity of the adhesive matrix while extending adhesion duration through continuous moisture management
3Ease of operation
If repositionability is enabled for visual wound inspection, then ease of operation is improved, but skin irritation worsens due to repeated removal and reapplication
Solution Approach 1:
The patent enables the adhesive to maintain its bonding properties through repeated removal and reapplication by incorporating absorbent polymers that continuously manage moisture levels. The adhesive essentially 'services itself' by regulating its own moisture environment, allowing multiple repositionings without losing adhesion or causing cumulative skin irritation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The polysiloxane adhesive composition provides sustained adhesion, reduces skin irritation, and allows for repositionability while maintaining integrity over extended periods, even when exposed to body fluids.
Implementation Method 1
one or more absorbent fillers dispersed in the polysiloxane adhesive
Implementation Method 2
The water absorbing properties of the hydrocolloids enable adhesion to moist skin by removing moisture from the surface
Implementation Method 3
The water absorbing properties of the hydrocolloids enable adhesion to moist skin by removing moisture from the surface
Implementation Method 4
As the hydrocolloids constantly absorb moisture emanating from the skin
Data Source
AI summary
An adhesive composition comprising silicone adhesives and one or more absorbent fillers such as hydrocolloids is disclosed. The adhesive composition is particularly well suited for use in negative pressure wound therapies.